I found this last pregnancy and thought it useful. This pregnancy, I can feel the uterus, so use this more as a guide, but if you're curious where your little sprout is positioned in that belly o' yours, perhaps this will be useful to you, too...

Very cool! Sometimes my womb varies by a lot on where it hits. Sometimes right at the 14 mark (which is where I am at) and others at the 18 mark! I thought maybe my bladder was causing it, but it's happened even after I went. I think I always measured bigger with the other 2, so I'm not worried.